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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '954a30629bbb6b72eb1d13c8a0c424fe4ca296cbf7d8dc3b0dbe3ed7f117f830' 
  AND token = 'ODz+wpcWEt6Fav0wMYHAPnqt+FfyZE6JicgWvT6I5Fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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