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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97d86d78fc6d90366e10f19f63641887c95db442f8f5f833c322fb4ebcd83be9' 
  AND token = 'sURxMJfB41TTn+3X2DEQMQUHQdt7cCK83RcTZiSiv48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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