SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a11e1b45ad295aa7460a94c1c63aed9f5fef2def192178610006dd438ad3173d' 
  AND token = 'F0EDQjosyzxbcYqU2mxhkmdHJwKPKbwHGhU2XgZTqUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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