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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdc043816f4f4d4102828421d12b2ac22ed6545b00f483e6678db7d2e8e55c74' 
  AND token = '6nCd+A+RECqIkKk2VoH9FkIdBv5QFDQLQ+navqbD9gg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}