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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d06794c808113ee37daf6916c08cbae3b7e02f6cc3ccce859ea78c7e84dfa2f' 
  AND token = 'fPlr5W8+AsUwrvl1seuE1lpzmRetmLeCXQa/09xS1jQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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