SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c19c268e287421baa16d1bcead7e90654e4b0a957fd570cdb1a001bc825cf749' 
  AND token = 'xqnG8Svp/ICoEpEbu/7Bxy9ZAwgGPR0B/bCZ6JCqpYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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