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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae47c79093be399e4d9df5e5c1fff6319c954608edc774f05811d013af59438e' 
  AND token = 'hrNt0XuM7JChfaeG2l/8m7dxbiKcVOStGSrulTciA/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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