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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a66b56d834f59fe5ad042e8a634b45562efe87f130f5da29a2cffe79ad7f811' 
  AND token = 'TluaWGDXadkgX9yZ305W7CTZCQbfHz12fKQ9WpR3iQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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