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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cc18b298b576298720f274ae8e6734d38c679176450d00f65d59d5276ba3ad2' 
  AND token = 'I0TEDYidmHUQmyCQatXj5CB73BqkNU30vkJQ/qFJg50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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