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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0ee6e87950973ad96559c8c5335463e361a35a4939db7779381727c92ec3c27' 
  AND token = 'Aq98EwaGJ5XzCW3La7FlmdBumTxF99K1HFHx3gl2iAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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