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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd91ba1864454b71109bd1471923eea65c17317c94ce2aa93c8ed9be184d69f7' 
  AND token = 'iFL3LfdZyW4N+vokiG3dOFQwH0hq7oi5CFjvp+zlLMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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