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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c844240ff842ef16b946cdae2f6fd8d654480d369e9edf81c0ade59b6f2e1db' 
  AND token = 'L6so3OGXV5FOOletwRYVg8BoonQe+mCmJMvP+jN66QA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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