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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab3c8a15f94c6704b90a8132113a15056d850d716cb67e957c26c377e75105d5' 
  AND token = 'NIAobeQXvYfody5ecCyt4jytsuFBYXDl+7k+Zc65TRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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