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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84bad7040d07f3fd346a36228a0f5488f189ff5b2595b27541dccbda8b1e69c4' 
  AND token = 'JhMd9rCikCbYfRis3kza7G5o5+eRdB5gHwbwid9xF7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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