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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7226453238da476f79af368d1784b4393006f1d8cb415bf0376aa766f1fd6887' 
  AND token = 'k/AwkXszgW/catOi5s8rAmXf09DvkicEz5Cft75BXbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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