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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33fa4efec1d249649f7d280114de4ae2c2c0bccb4db04c8b657d5afd722cd439' 
  AND token = 'ADr5YfKJ5xabl7ngJhihU/xVKV+cQl2LxSyRKe5jkYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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