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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '323a20f1029c044bbaafa61b0ded4af42c823a6b8260b7078a8032252261afb5' 
  AND token = '1do0MeKjFnx0bifAyg6vqbp52k5jA3jDeo2JlGx9Kew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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