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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd149a96ceeb310473e1ed3c5c8004d1b5f1b8eb9c0c3985d85acde5cd661060' 
  AND token = 'znsCsD7eZ6pJmqgA0uiWQ4krY956wYSPt9MK7OpPDsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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