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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4124993e85dbe629c95369a494cc7853d813dab50cf161f9f72204b4115e1bd' 
  AND token = 'lNrAgNivx26K70wJK3a68saAwtZ03wLWzU88CBW51zI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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