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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c94d2d55e706c0f4fa25b6fac1a6fe9744110748f88edc88c35ffb41e472685' 
  AND token = 'Wskdr7GzkiEQbcMOEHispaK6S0h0CvrVWpQz+olE0DE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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