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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd79c6638635d4d7dce998bba24580d81021f01c35dfffbffc32019a9f5ab4f43' 
  AND token = 'kUQbk2iQz01uQ8AluhLG9AckYl1jBl/eqH2vl4COvAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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