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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2903bfcab30e563b3ceb06696c0e8c343450a906eeaba944b9161a0ed1607d6c' 
  AND token = '5EST0u60Gu2i6xcF8UaiBu8uzlyH7uU94bAPWPqgr50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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