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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1a3d904871b6094e11e087df7fb5e0be2f17d63b67990d2aa9bbb6fe04cae81' 
  AND token = 'Nc5j3u1ngzNm/nig9b3FiqMRpsv+kil+DKhl8Y4svyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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