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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13bc99d6ea3e5e99eb8a3b55a6d9d76a6648ae39e3d3af64240b8c70629dec80' 
  AND token = '3bAdfxTJrmqQuhpBfHSpu7koSWFbtZ/VK83tGXosssk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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