SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '169ff20dd2d625888cf81a0649e94c965255f672c77f1916b4d2bf02435f4c38' 
  AND token = 'xAjLOFg4sEUPGfvGQUYjL/dHOAD8uV/fPSpuNQXBjs0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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