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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f17d8072a7f1c8f687376a18aeb61bde874be90df1372a9b6fc0bde7d1e6a8b' 
  AND token = 'R7Z7fGWggzCqyUs4xYsscaQ8ug7j253Xket3H76oWLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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