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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b246a35b60ccd51182e4dfd9ef5c068430d6d68ccc0c2db5777b97128e97b9ae' 
  AND token = 'n70zSZ3wS90szCDt3C/KVVbN8ZTIhvuk9s577Tc4Cs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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