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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13fca0b5eb68be7ea78e8d7fcc1b7c09f6c9f093b0be5339f4bac54610cd7df2' 
  AND token = 'bv7SygWjpawOCVlIjfdHFTOVtjxtIqBMgImhK9/aDww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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