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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faa73c614a752f1a0c67906a446cab3bf24ae1f6f896d6e647b4b7ae92aada89' 
  AND token = 'WizvlH+SzEWSkyMKo0s3ytcpkOpPm+7hnKpYHHLuMH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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