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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fd888d16ad0cb20617b2c471ec1df7b6324938a0efa94c3872f74e41f87670d' 
  AND token = 'jwkvLft+JaFOi9N1wWyGGIE31/xdUu9dG0DnrTu6xNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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