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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19e60f11e4f461a02a665342a4fa5ca68a7ce710538e09f376d5684d54a53e0f' 
  AND token = 'nBK8sbFzztomp4XW9A7zdOx5WxvCCPYIB+F6dpB4ifs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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