SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b74d58b5a86c76a697c13f2f98ea51f8c54a20441368595d2022fd869bc17763' 
  AND token = 'tRnq+expwi+2/gqjjuwslx3RLecuvutkaAIlqNBUTfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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