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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd32689c43c84e2878ad63a9a1bb1404969bd644815b41762a425b6362369dedf' 
  AND token = 'zUJlRW/rRD2PivfWtPxczqxGHfM9WdcmNLR5XwD1OAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00095

JSON explain

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