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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35231990d198f8dc0efec17f148a1f2528c70049b88d349e458fa874d7a55487' 
  AND token = '1JbQngDUgB3eUe2N+b7VSHOvDz9Rg1ORfyGMLpwAVXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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