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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f90ff0b3ec33b30720c860141d14a2a222f88d17d7459e9469a8bbb447b16042' 
  AND token = 'MoKiunmPVoYp73WuMiJeJoXWX+neANNHgwU+nBslIaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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