SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd80ec151f0c764b312bfc317e84a9de7c919309af64ffa1150f7e7aad4219c5' 
  AND token = 'YvCECKxO+bHEAF+g7GpmlMl4L/qhxOl6ndc9FnPBpsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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