SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54060b38699063b067507f22147884dfb7c15c6769e1940d2ad3f641cee73d76' 
  AND token = 'CrZYTzFgKu88nPsz4U3zDSxrmNw2LlGA7Hh7m8Vioo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00084

JSON explain

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