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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9e2f13ca44c96d225b38ee9a55b8960388ecf62f6de82410751ecd973b53934' 
  AND token = '0lb8uyBqt5cSDSpa3VaABe1szNf53tDJCSHoCRzPHiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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