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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8872abea8d96d2177250b83d120f3710019ea5143b42a2c278c207361cc3bc9' 
  AND token = 'HAl/EpH75QhyfdNzJ/APLKIJjtma4QDHlWB0PSvukXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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