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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '326fd275f79386f487b8a057ccc51613c656fc2a32b3e7aaff8535ad9f97424f' 
  AND token = 'Arj4RljrY4mUyZlxM74OQD+etr5qo0KpEu6l6VEBo3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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