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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a2f8c91ed4167b4fb2f80acb8f1848a5beec8e71090f1125bf7e8bd44e7331d' 
  AND token = 'RyIh+AVxJP/SFRwPDor3r5nvlyeK6h03oenFLhV7Xq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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