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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ac63464007250e243327c996f3b5fb78c097c9bf9cd2b1f55291a92a1ba6317' 
  AND token = 'eG9/caVMLAsOTfltq/DXlwvrGzvtruX/9IAIbaLq0nI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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