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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dda577645dbe0ea900d6d594cf6ec173360512c465855fc8dcae6446b3f6317' 
  AND token = 'KAZuT8NrEdbCwN7uI37bbvQXjodnmTOYZdf0FHq3cSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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