SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1592986d63024a1f90b698108452ae94b57f70f62d9d31fa7eb4bc1c898ca54e' 
  AND token = 'xxYDn/BrMQTZr5PRw67q6GiCWMfNzpRj2METYkB/SiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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