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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12033c684c7ffbd1e5f79d6d44716652a064d9a6efb2ca002d8d08f7037ec5ce' 
  AND token = '56f8jcbXIQILTxBAU5CWP7AWtkpr2qGr1Z8sg2QmDl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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