SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25610ab8f50dc85a8b9cb049b26da015025fa6fbc16e93787b5240bacf43954a' 
  AND token = 'ypMShEQZkhjIkiPj4F+rqcJAT2kV5T9zO2XKkKGJrVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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