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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee3d707c6f1c599f54b81c542c8fc2fb9a8fe985e8918052b47eda8f5bada0bd' 
  AND token = 'SMtiD2TBt7pinGQHML8mSPR70Ln5hTAqXV/oJVK67iQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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