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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83b8232a4dd06843fe941f247f4546fbfdcf97ac44480f914bb6d1b58c147c87' 
  AND token = '8njJcchFvhAp6ml+g9m1SuP8I/sxrCtQ/KvWIneuSdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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