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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c28882866e07cf582b1ecae0153099b53ca032adab3dd448903bce8607c9850a' 
  AND token = '/5LMfcWrcYLD0RM9SYQRqNYEQaN4zgdCqBewv+1+7Zw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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