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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5c45159956fee8714722b614b8791ce6fe67d1693cb43a4455f509fbfd2e46f' 
  AND token = 'dcc9yPVbFmsQimJ68QqKQmMAAAg6uBh5c4aBFoB+m14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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