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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '054fbe4c0daddc29b0b64d1cec93f2de3dd358f5a5a2bbc6a9ec87a1ae9b5c0e' 
  AND token = '2BdvAo0YUtQd/e9l1V/EZU7iVRsLaOuya6I6PWdYTlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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