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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2437f64f6571899682cfa0c7c5a692aa744a3b8896696cdb250523c595cd20c1' 
  AND token = 'GJKmZnc5D8ydrsnGV5mRY/ppokvYgy72xMacYQTCMYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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