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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '045e757ac722e4e535005dd1bbd730ca41fc0456438333b10a56a774252ac687' 
  AND token = 'LPC1nX6JLt2hgyvQBaQhG7eceljshVXqw8r4dhOxMWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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