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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88b27bbd7333eb5c50f1a7c6757142df32b0c6e5f63ad3ce3e19c6f803aac09a' 
  AND token = 'QfcX5lwcx24RMG3L4M7EqbCU5yrfpnmnNurR5LY61rA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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