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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee8bc7367411700467d7c0e2f99be1dea4c9019d9f875bd1ce9d3a6d170e467f' 
  AND token = 'yU/reQMo0srHF/yJbMnE6wcrg92DSiN1VEIA285XiAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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