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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd01d40beae0ecd4824946b69a4ca264fb7ed492f43a485526be1d0b8e76dd44b' 
  AND token = '7HkJlmzEghkIEfEh2TDFupkEsP4Ek1LWNOXveAfKKbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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