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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bf6ab8bea1feac9a27685c2b38902363e182ff64a5a63315131a057482a75d7' 
  AND token = 'OxAGVqfUbCPRMDlpo9NI/5heae4yeYyugc6vT45Tbsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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