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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e362fb9c48a1801eff93eea00506c133aae2286f198d7a9f800929092a8cfe5' 
  AND token = 'C5zadXUmUO+i9yiHEx7eNv4+xaIesSlJiGgACg/6+u4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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