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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f17029a2467e077c9979bce49cc29183af913ea9d5f3e348e42c4b3a82cdf925' 
  AND token = '4F1N9sfd5s+aznXPb68v8QWQvpGcAUTo3HZuYJU0TxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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