SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bee3ec884719c2b06c94b35f8c97067e69792d9180341d8429b4538702be620b' 
  AND token = 'dv+4e1+hKk+teHjFf1QzsqUJTj5zZ7SEgx2xVBpMies=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00112

JSON explain

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