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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9520334842a2adad4e612fcfdfb9518c810e8184b19fd152cf0e62dbe3bf0484' 
  AND token = 'riCX0AlOHkv93pTHwhwZqD4rVUyQv3vmRL9P86WVm10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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