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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3b748825b41ac3989069fbeeb69187fef1c081f72e7a2afbe96102cb44cd029' 
  AND token = 'JhPms182irlshQJTl4tBAO6VXaOYvC9ItEdLU9WDQWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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