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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '732bd8e10913953aeec33637110f5365447784a706608fcb04782a54fb3106d9' 
  AND token = 'Tvh5+i+ZBwpP06ogwLwBUUi32niBAcyMMtW35h8xTZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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