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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd99b67565282df786bf8657822f59f033542de24e2ae7f445b2f71cc66ce5e07' 
  AND token = 'ddQlLLNLwzP5l3bXvUUrxJHoBXbWrjCAG0oermwF1NU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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