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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34d222368499b7db7860bad6178eba45f2c2d81eb28dfd6e9dbe058438c363ee' 
  AND token = '43rL65rHYTynF5C0+VkGIPtcZHA4+Fpzig4mLNKoYBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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