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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7d8d600bf040610b2233308ccd86e343e04e6fd9f6570caf276aee7c0699cc4' 
  AND token = '00piN2D/BhxT+8Jx7lG5zUhFCAqCQaHC9qC93se1RXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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