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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8721bd8fe50ddb1fdb7fff1b1ca314c30a4c211ec360f2c34a55d49ec83c02a4' 
  AND token = 'RMqDbSmS+G8dSaTItD9k0AQ4ltHMr9Ql1r7IKFt4BrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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