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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2752f1ad6c76bdf1321d4cc108d561c4cad4c4d86e51940bdcc4b5550610364e' 
  AND token = '7Vot3JDY00ixHz24XJ+wDHK3YlOlABiPM8vsk8NxJ14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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