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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9802244c6cce599129ad23edc91163d26991c50db98b89f657014cb7110b5ece' 
  AND token = 'hoVpBFXrsV7OSHwE0gtXuWXQ3sQCfZtCkz7C/CaMZM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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