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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73f0c65d49450cc98f24cf1c51c4fcd4a9ab01f6c334b7a8f79afebe9163352c' 
  AND token = 'ByKMmyX8FHTXbHCVIS95sq9YxLvYoLm+r+3U5OnkQA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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