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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36376d370f69645ad633f31e6304706d9bd04f511f6f06b3b9a564249ef95d7f' 
  AND token = 'leuXyl6eWQ+JQl3yqdPRxDxhhwVcmihE4nbJ6gLy3sU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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