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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9125a77544dff7efa52bfede2348ae501ac519d4f49dd2259a517921b2347a56' 
  AND token = 'DYLTvXtOLJQ0+NuF8w7hP1Y8xZ33tE5dwUYcQiwM7zE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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