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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c16a0e5d954f1534425246484f079f59532485a4e30ba420e49aa33970bd1ec' 
  AND token = 'FoULzjdZlRg4weuzlR+zs2cpopTKm42JQYUXd1JZ4cs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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