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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d51845d0ed7adc867d85bccdec5ad79529d6b16349d163df3720c057689466a' 
  AND token = 'kSllAaciPom067y6c4mk41I81A3hb5tS7YFNt0pTw48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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