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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c77dc158c8278c9f9a78075eb82168135796aeedd36176b348c54cfd0d93c26' 
  AND token = 'DBDwPamyUGb3q6A7SCzL7guADAyeXZPL+eFAZN0fbJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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