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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe74863f1aed56017fbb6267ff2757ff8c46065a6d04f6aa8e706786d957bb77' 
  AND token = '7MVkXDKOCd7bS/GfhifBQukXaI2Z8P1J9psQcQykL1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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