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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '737e21cefc8a59acb57b319504fe49eb36840918994308a3162d96ee9b9442e8' 
  AND token = 'Pi/h9uIknt4tSkSmne2jKvshSTIiSM/jrOxQKG8QqNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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