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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b53edee4ad2633fe571b182445ca4056638df636c70dd1b0fa08fa75f5b8db8' 
  AND token = '3OF0hCkODZ0EztwAIDd17a8by10WFk45B2q9H9ITcEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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