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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fdc1f5fb2d12de79a73f410cfba6ccb77e0c83c45b4fe7b10b25680a5ca03fd' 
  AND token = '38Jcr5zXtWeRsuGImqPo6096YLRoO7/UL7n6YiHYFS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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