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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3edb5459f1b93b819aab3fa5b1d96e10b6354af13af37dc86f7989063e75e80' 
  AND token = '99WdjoztqKSKcd1LH7VyWmTveZ655gcN5tY1wjyBYx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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