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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc9c495ddc1aba85d34b1b65af3c603af6c188dc20e3ea110b2e120a152daa0d' 
  AND token = 'P9CtgLik1IbjcSRnUSMnbgHknvvtyy8jqEDEEOqLNUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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