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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd0235a720a73af248b91b28e99ed19d8d3c35eb22c695f3ffeee8abea45576b' 
  AND token = 'KqedbBfPf9u6jFaSkGegIjnOkQ1eaMYwGKufks9cMeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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