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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3822bf0f412acf187985c964b3283bc3ed4635db49bb980f2905ada42de154a' 
  AND token = 'rfn7LNh8AiNM+xe+bBlL4JAkzZj8BE0Hs92TUQ7jCtw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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