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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '176f62e993a58464e7f28501156d5d8637cc57e6f767aa5d56f0e36764a288fa' 
  AND token = 'SdMSyfSpl9VTzjXug5fSTk2hkupw8WeD0Tg9qEKEH3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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