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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f85e485c6b98c75085c014170ad21f6a6f8afd6c831b0f6bae070f3c0bf775ee' 
  AND token = '2Levl5EJuYaB75DWIZfMvJ7FiknwEj9mowiAlV1eNHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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