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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '799bbaf0e50f4cb597a7cd0bed6c02c9852baf1201872c83608edbb4df5808f4' 
  AND token = '6R0jrWR3acjOAte4Jnljwfs/0awl+xpI0Xon3C9jGTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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