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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5de163f0a0df9cb22db5dfbc8663eff7a85c9f292bbe56d6c4318f45e56a37ff' 
  AND token = 'BSvC5c8Vkqfe0yJ+lB4CqybRHMNp55bfI5NFRQZIosY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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