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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '781cb34bdbf6c0901af8fce169e142358a5ab8b80916153ab17d743a2bb6060f' 
  AND token = 'sC4BBrjy56N5PwbY2TgkbncldL/ZWzX/KeD0TBK43Kc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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