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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9409f8c649db02a27a50f2f0814faa6ae661bac2eda38111b6b71daac98af3e' 
  AND token = 'ngZgWZLVr/vq4X6AVQKixJgOi6obKe711Y16pWyatag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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