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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb1857eaadc8e1a8d0411a427008d4bd1458f24239f63d55dbdb189e54b9c6f7' 
  AND token = 'HVWlV+Axh0pARzIjjT+6OnMQvxc7p3enAyRCluB6uGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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