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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40a15448bc554d134d7eaadc31f41b1ca7c84ba12848b72dbdc23d9e0aeeaefd' 
  AND token = 'uBGA7eHUKHkKcjXC6bk8uX2+//u9uzNtH0YGLg41has=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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