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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05736a07098a44da3ca0254b4398232a9b167175760cb0e74a73b5bcb77aa002' 
  AND token = 'Hric6C/0L8UHFgLjy6HfczsupBVaUd2kAx8OWuJv0h8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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