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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b03b8728feff2ded60abd537bc7f1eb033f4de0f3f3d83b9ae39bf360c30aed' 
  AND token = '1Y3bLDn2jFe3YtcsWtb/DyduG0vTWXigF3L0lShl08o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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