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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4cb2553dc48711f169971a0353223bd21a3739f6de4daff504ec403880c8208' 
  AND token = '38IJ4ktLYgpXyXfOe654qS014KQnVMyy9lJNvavRa9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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