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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da9f3c32e29a703e5c4273eb15904bef8a76568a58fbddd087bb5f8ae6961d94' 
  AND token = 'PgBTGfRKMJXju1ITGR/dF/PehbMS6kYS6I23SFO6rNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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